Link to a 13 page tech document about line arrays, it gives a good explanation about the high frequencies comb filtering (the cancellation and boost effect) but it is the same for your low frequencies question, the reason for it is different, on the high frequencies using the same speakers comb filtering occurs due to speaker placement and room acoustics, on your system the comb filtering occurs due to the difference in frequency response of different speakers (725 Vs 728s) and that overlap in the crossover frequency you wanted to do.

There is no way to eliminate the comb filter effect in the crossover zone (+/- one octave), but we hope it's minimal.

I mean lamps in speakers crossover. I don't have any link because I'm talking about putting lamps in speakers they don't have by manufacturer, like my SRX. I'm interested because I've had a bad experience with a friends MRX system in a live event.

I mean lamps in speakers crossover. I don't have any link because I'm talking about putting lamps in speakers they don't have by manufacturer, like my SRX. I'm interested because I've had a bad experience with a friends MRX system in a live event.

Look at this thread, especially the replies by Andy Wehmeyer (from JBL) for the posetive and negative aspects of bulbs in crossovers.

The SRX are much more robust but what happended with the MRX setup? did you blew a HF driver?

Two of them actually. 515. One at a time. I am disappointed of those drivers. Can't push at all for live use.

That's not good, most probable reason is clipping somewhere in the sound chain, other than that it could be too much power going to the speakers, a faulty amp could do this as well. You didn't hear any distortion? Is it a bi/triamp system? What amp is powering them?

Those speakers are powered by a digital QSC about 1100 watt at 4 ohms, I don't remember the type. Anyway there was some kind of ups and downs but it was far away from a big deal, besides there was another set of EV (smaller) and they are just fine. After all these my first thought was biamping the tops with a DRPA for some serious limiting/crossing which already have taken place, and my second thought has to do with my question. So any other good advise??

Those speakers are powered by a digital QSC about 1100 watt at 4 ohms, I don't remember the type. Anyway there was some kind of ups and downs but it was far away from a big deal, besides there was another set of EV (smaller) and they are just fine. After all these my first thought was biamping the tops with a DRPA for some serious limiting/crossing which already have taken place, and my second thought has to do with my question. So any other good advise??

Well, if both drivers were fried by the same amp then that raises my suspicion about this amp being as healthy as it should. 1100W amp should be working really hard to be able to fry this speaker unless it was clipping, did you feed it a full range signal (much easier to clip the amp) or was it working with subs? Then again, if the EV survived then it might not be the amps fault.

I think more experienced people are needed here, are you registered on PSW forum? soundforums.net? You want me to open a thread for you?

Yes there were subs, no there was no clipping, the amp is working perfectly... and there is no need to worry about these two diafragms. I'm sorry if I gave you the wrong impression. I am interested in putting light bulbs in my system, and I could really use some help since I'm not registered to any of these sites. So if it isn't that hard for you feel free to enlighten me anyway you can, as you always do. Thanks.

As I said earlier, this is beyond my knowledge scope so I posted a Q on the PSW forum for you. Here is a link to the thread so you can follow it. I'll update this thread as well when we get some good info. This should be interesting